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Romanian analyzer

The built-in romanian analyzer can be applied to a text field using the following command:

PUT /romanian-index
{
  "mappings": {
    "properties": {
      "content": {
        "type": "text",
        "analyzer": "romanian"
      }
    }
  }
}

Stem exclusion

You can use stem_exclusion with this language analyzer using the following command:

PUT index_with_stem_exclusion_romanian_analyzer
{
  "settings": {
    "analysis": {
      "analyzer": {
        "stem_exclusion_romanian_analyzer": {
          "type": "romanian",
          "stem_exclusion": ["autoritate", "aprobat"]
        }
      }
    }
  }
}

Romanian analyzer internals

The romanian analyzer is built using the following components:

  • Tokenizer: standard

  • Token filters:

    • lowercase
    • stop (Romanian)
    • keyword
    • stemmer (Romanian)

Custom Romanian analyzer

You can create a custom Romanian analyzer using the following command:

PUT /romanian-index
{
  "settings": {
    "analysis": {
      "filter": {
        "romanian_stop": {
          "type": "stop",
          "stopwords": "_romanian_"
        },
        "romanian_stemmer": {
          "type": "stemmer",
          "language": "romanian"
        },
        "romanian_keywords": {
          "type": "keyword_marker",
          "keywords": []
        }
      },
      "analyzer": {
        "romanian_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "romanian_stop",
            "romanian_keywords",
            "romanian_stemmer"
          ]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "content": {
        "type": "text",
        "analyzer": "romanian_analyzer"
      }
    }
  }
}

Generated tokens

Use the following request to examine the tokens generated using the analyzer:

POST /romanian-index/_analyze
{
  "field": "content",
  "text": "Studenții învață la universitățile din România. Numerele lor sunt 123456."
}

The response contains the generated tokens:

{
  "tokens": [
    {
      "token": "studenț",
      "start_offset": 0,
      "end_offset": 9,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "învaț",
      "start_offset": 10,
      "end_offset": 16,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "universităț",
      "start_offset": 20,
      "end_offset": 34,
      "type": "<ALPHANUM>",
      "position": 3
    },
    {
      "token": "român",
      "start_offset": 39,
      "end_offset": 46,
      "type": "<ALPHANUM>",
      "position": 5
    },
    {
      "token": "numer",
      "start_offset": 48,
      "end_offset": 56,
      "type": "<ALPHANUM>",
      "position": 6
    },
    {
      "token": "123456",
      "start_offset": 66,
      "end_offset": 72,
      "type": "<NUM>",
      "position": 9
    }
  ]
}
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